Specifications For Insulation Tests, Protection Class And Degree Of Protection - Siemens Simatic CFU Commissioning Manual

Cable temperature
Note that the temperature properties of the cables must correspond to the actual measured
temperatures:
● When a temperature of 70 °C is reached on the cable or at the cable entry of the enclosure
under operating conditions.
● When the temperature at the wire junction can be > 80 °C under operating conditions.
You specify other connection types and material requirements based on the following:
● Electrical characteristic data of the circuits you are using
● Installation environment
See also
Rules for the operation (Page 21)
12.1.5

Specifications for insulation tests, protection class and degree of protection

Test voltages
Table 12-9
Circuits with a rated voltage of U
circuits or ground
0 V < U
Protection class
Protection class I in compliance with IEC 61140; this means that a grounding terminal to the
rail is required!
Protection against foreign bodies and water
Protection class IP 20 according to IEC 60529; that is protection against contact with standard
probes.
There is no protection from penetration by water.
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC
Test voltages
e
≤ 50 V
e
relative to other Test voltage
500 V AC, 60 s
Technical specifications
12.1 General technical specifications
137